Dynamo-electric machine



Sept. 9 1924. 1,508,251

H. G. REIST ET AL DYNAMO ELECTRIC MACHINE Filed Oct. 30, 1922 Inventors Henry G-Reist,

Th eir Attorney:

Earl S. HenninQsen.

Patented Sept. 9, 1924.

UNITED STATES PATENT OFFICE.

HENRY G. REIST AND EARLE S HENNINGSEN, 0F SCHENECI'ADY, NEW YORK, AS- SIGNORS TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

DYNAMIC-ELECTRIC MACHDN'E.

Application filed October 30, 1922. Serial No. 597,719.

To all whom it may concern.

Be it known that we, HENRY G. Ernst and EARLE S. HENNINGSEN, citizens of the United States, residing at Schenectady, in the county of Schenectady, State of New York, have invented certain new and useful Improvements in Dynamo-Electric Machines, of which the following is a'specification.

Our invention relates to machines and particularly to a novel construction of a core member of such machines provided with two windings. v 1

Heretofore in building a member of a dy namo electric machine provided with two windings,

was not possible to remove the winding, which it is often desirable to remove, without removing the other also. This was par ticularly true where one of the windings was composed of coils and theother was a short-circuited winding acting as an amortisseur or starting winding. In a machine provided with two such windings, occasion does not arise to remove the amortisseur or starting winding, but often the other winding must be removed. On' the'other hand,it is very desirable that the a-mortisseur or starting winding be placed near the "surface of the member in which the windings are embedded. In accordance with our invention ber of a dynamo electric machine and'the one of them, which it is desired .to remove,

may be readily placed in position or removed without interfering or disturbing the other.

The various features of novelty which characterize our invention are pointed out in the claims annexed to and forming a part of this specification. For a better understanding of our invention reference may be had to the following description taken in connection with the accompanying drawing, in which Fig. l is a perspective View of a core member of a dynamo electric machine embodying our invention, and Fig. 2 is a perspective view of a detail.

Referring to the drawing, 1 is a core member. of a dynamo electric machine having slots, in each of which there is disposed conductors 4 and 6 of a plurality of windings. Each of the slots has a reduced section 3 throughout a portion of its depth in which the conductor 4 of a winding is disposed. The slots also have portions5 in dynamo electric or the like,

the construction was such that it,

two windings may be placed on a mem which only the conductors 6 of a winding.

are disposed at the sides of the conductors 4. Each of the slots is preferably T-shaped with a conductor 4 in the central portion 3 of each slot and conductors 6 in the projectlng portions 5 of each slot and at both sides of conductor 4. The conductors 6 are connected together to form a short-circuited winding through end rings 7. The end rings 7 consist of plates of suitable conducting material, such as copper, bronze, brass,

and have slots 8 therein of substantially the same shape as the slots in the core member so that the teeth on'the end ring correspond in shape to-the shape of the teeth in the core member. The ends of adjacent conductors 6 on opposite sides of a tooth in the core member are bent and fastened to a tooth of theend ring as clearly shown in Fig. 1. These parts are shown as being fastened together by bolts 9 and 1n practice, silver solder is employed in addition to the bolts.

The conductors 6 are shaped as shown in Fig. 2, with corrugations 10 near the ends of the conductor to allow for expansion'of the conductors during the starting operation when these conductors are apt to become quite hot due to the starting current.

The core member 1 is composed of laminations held together by end plates 11 having teeth 12, as shown, with slots therebetween of such width as to allow for the expansion of the conductors 6 during the starting operation.

The conductors 6 are first placed in the portions 5 of the slots which are of greater width than the portions 3. The width of the conductors 6 is such that they form sub stantially straight sides with the remaining portions 3 of the slots after they are in place. The conductors 4 of the other winding are then readily'disposed in the remaining portions of the slots, without any interference from either the conductors 6 or the end rings 7. The conductors 4 are parts of a coil winding and thoroughly insulated from the core member 1, and are held in place by wedges 13. If it is desired to remove any coil formed of conductors 4, this may readily be accomplished without any interference from the conductors 6 and the end rings 7.

Our invention is particularly useful in the cylindricalrotor of a synchronous motor or generator, in which the conductors 4 form;

a distributed field winding designed tobe excited by direct current and the conductors. 6 the ,amortisseur and starting winding, 'llhe' rotor in such a machine is provided inaccordance with out invention with 'an amortisseur and starting windingi rwithoutsacrificing any of the rotor winding space or without weakening the rotor constructiom We desire it to be understood that our invention is not limited to the particular arrangement shown and described, andi we aim in the appended claims-"to cover all modifications which do not depart iirom the spirit and scope of our invention.

*Whatwe claim as: new and desire to'secureby: Letters Patent of the United States,

1s.:.--.- r i L V Ina dynamo electric n1achi ne,. a coremember having slotstherein, a plurality of windings having conductors in each oi saidslots, each of said slots having a reduced section throughout a portion of its depth,

one of said windingscomprising conductors disposed in the reduced section of said slots, WHId'IIIgS COlIlPllSlIl and the other of said conductors disposed 'only in the other portion oi the slots and'at the sides of the first mentioned: conductors, said conductors in the reduced section of said slots being removablewithout interference with the conductors of} said otheriwi'ndings- 2. Ina dynamo electric mach ne, acore member havin I slots-therein,-a plurality of windings having conductors in each ot'said slots, each. of said slots having a reduced sectionthroughout a portion of its depth, one of said windings comprisingconductors disposed in the reduced section ofsaid slots, and theother-oi said windings comprising conductors disposed only in the other por: tion of'the slots and at the sidesfthe-fi'rst mentioned conductors, said conductors inthe I reduced section'of said slots being removable without interference with the conductorsio-f said other winding, "the conductorsof said secondfmentioned Winding being connected? together to form a shortcircuitedwinding; 3-. Ina dynamo electric machine, a core i member-having slots therein, a plurality of betweensaid slots, each of said slots iiaving' a reduced section throughoutv a portion of its deptliua Windingcomprising conductors d1sposed in the reduced sectlon of said slots, a

winding comprising conductorsdisposed in the'othe'r portions 01": said slots, and-at the sides of the first mentioned conductors, and an end: ring having slots therein forming teeth therebetween corresponding in shape "to: theiteeth. in said: core member, the con ductors of said second mentioned winding to-form being connected to said end ringshort 'circuited winding 5. In a dynamo electric machine, a core memben having slots therein ior-rni-ng teethbetween said slots, each ofsa-id slots having a reduced section throughout portion of its depth,- a winding com-prising conductors disposed in the reduced sectioned said slots,

a windingcomprising conductors 5 disposed in the other portion at the slots-and at tlie sides of the first mentionedconductors, and an end ring having-- slots therein forming teeth corresponding in: shape to the: teeth of'said' core member, the ends of adjacent conductor's of said last mentioned winding on opposite sides of' a tooth-in saidlcore" member being bent; and fastened to'a tooth 013 said end ring' to form ash'drt' circuited winding}; 1

6*. Ina member having substantially 'F-shap'ed" slots" therein, a plurality of windings'havjingconductors in each-of said slots, one oi said windings comprising conductors disposed in' the central;portionfof saidislots, and the dynamo electric machine, a core.

otherof; said'fwindingscomprising con; ductors-j disposed only the projectingpor tionsof said slotsand at the sideskoffthe' first mentioned conductors; said conductors disposed in ,theicentra-l portion of said slots being removable'witliout interference with V the conductors ofsaidother winding.

7'; In a dynamo; electric machine, a core member having substantially T sliaped slots therein a plilrali-ty of Wi-ndingsrhaving c011"- ductors in each of said slots, one of'sa id windings-comprising conductors d iispos'edin the central -portion oi; said slots; and the. other of said windings comprising, conductors disposed only in the projectingpoivtions' of said slots and at the flsidesroiithej first mentioned conductors, said conductors V disposed in the central portionof said slots;

being removablewithoutinterference with the conductors of" saidi other-winding, theconductors of said second mentionedi winding being connected together to form a{ short circuited winding 7 a t 8. In a dynamo electric machine, a core member havingsubstant'iall'y 'Fshaped slots therein forming teethbetween said; slots, a winding; comprising conductors disposed in, the central; portion of said slots, a winding comprisingconductors disposed in the'; pro

j'ecti'ng portion of said slots" and atflthe sides of the first mentioned conductors, and an end ring having T-shaped-slots therein forming teeth between said slots corresponding to the teeth in said core member, the conductors of said second mentioned winding being connected to said end ring to form a short circuited winding.

9. In a dynamo electric machine, a core member having substantially T-shaped slots therein forming teeth between said slots, a winding comprising conductors disposed in the central portion ofsaid slots, a winding comprising conductors disposed in the projecting portion of said slots and at the sides of the first mentioned conductors, and an end ring having T-shaped slots therein forming teeth between said slots corresponding to the teeth in said core member, the conductors in said second mentioned winding fitting into the projecting portions of the slots in the end rings, the ends of adjacent conductors of said second mentioned winding on opposite sides of a tooth in said core being bent and fastened to a tooth of said end ring to form a short circuited windin In wltness whereof, we have hereunto set our hands this 28th day of October, 1922.

HENRY G. REIST.

EARLE S. HENNINGSEN. 

